Olinuxino GPIO board extension : OliExt

I can’t use Olinuxino as it is on my existing modules because of logic volatage : 3.3v on Olinuxino and 5v on my modules. So I decided to create an extension board that I will plug on Olinuxino board :

With that extension board I am able to do :

48 digitals I/O 3.3v or 5v
2 Serial ports RS 232
1 GMS module + micro and speaker
VGA out
I2C port 3.3v and 5v
CAN-Bus
XBee
Energie meter (Téléinformation)
Display 7 segments

You can find schematics on my Github page : https://github.com/morind79/wiringOli

For the moment I am with revision 4 of the board, and seems this is the right one

I use it since march 2015 and all is working fine.